#!/usr/bin/env bash

function diskspace {
    clear
    df -k
}
function whoseon {
    clear
    who
}
function memusage {
    clear
    cat /proc/meminfo
}
function menu {
clear
echo
echo -e "\t\t\tSys Admin Menu\n"
echo -e "\t1. Display disk space"
echo -e "\t2. Display logged on users"
echo -e "\t3. Display memory useage"
echo -e "\t0. Exit program\n\n"
echo -en "\t\tEnter option: "
read -n 1 option
}

while [ 1 ]
do
    menu
    case $option in
        0)
            break ;;
        1)
            diskspace ;;
        2)
            whoseon ;;
        3)
            memusage ;;
        *)
            clear
            echo "Sorry, wrong selection" ;;
    esac
    echo -en "\n\n\t\tHit any key to continue"
    read -n 1 line
done
clear
